chr21-45997744-G-C

Position:

chr21-45997744-G-C

Variant summary

Our verdict is Benign. Variant got -21 ACMG points: 0P and 21B. BP4_StrongBP6_Very_StrongBP7BS1BS2

The NM_001848.3(COL6A1):c.1506G>C(p.Pro502=) variant causes a synonymous change involving the alteration of a non-conserved nucleotide. The variant allele was found at a frequency of 0.00183 in 1,594,036 control chromosomes in the GnomAD database, including 42 homozygotes. In-silico tool predicts a benign outcome for this variant. Variant has been reported in ClinVar as Likely benign (★★). Synonymous variant affecting the same amino acid position (i.e. P502P) has been classified as Likely benign.

Frequency

Genomes: 𝑓 0.0092 ( 24 hom., cov: 34)

Exomes 𝑓: 0.0010 ( 18 hom. )

Consequence

COL6A1
NM_001848.3 synonymous

Scores

Clinical Significance

Benign/Likely benign criteria provided, multiple submitters, no conflicts B:5

Conservation

PhyloP100: -7.15

Variant links:

Genes affected

COL6A1 (HGNC:2211): (collagen type VI alpha 1 chain) The collagens are a superfamily of proteins that play a role in maintaining the integrity of various tissues. Collagens are extracellular matrix proteins and have a triple-helical domain as their common structural element. Collagen VI is a major structural component of microfibrils. The basic structural unit of collagen VI is a heterotrimer of the alpha1(VI), alpha2(VI), and alpha3(VI) chains. The alpha2(VI) and alpha3(VI) chains are encoded by the COL6A2 and COL6A3 genes, respectively. The protein encoded by this gene is the alpha 1 subunit of type VI collagen (alpha1(VI) chain). Mutations in the genes that code for the collagen VI subunits result in the autosomal dominant disorder, Bethlem myopathy. [provided by RefSeq, Jul 2008]

COL6A1 links:

Genome browser will be placed here

ACMG classification

Classification made for transcript

Verdict is Benign. Variant got -21 ACMG points.

BP4

Computational evidence support a benign effect (BayesDel_noAF=-0.83).

BP6

Variant 21-45997744-G-C is Benign according to our data. Variant chr21-45997744-G-C is described in ClinVar as [Likely_benign]. Clinvar id is 258286.Status of the report is criteria_provided_multiple_submitters_no_conflicts, 2 stars.

BP7

Synonymous conserved (PhyloP=-7.15 with no splicing effect.

BS1

Variant frequency is greater than expected in population afr. gnomad4 allele frequency = 0.00921 (1402/152218) while in subpopulation AFR AF= 0.0319 (1327/41552). AF 95% confidence interval is 0.0305. There are 24 homozygotes in gnomad4. There are 672 alleles in male gnomad4 subpopulation. Median coverage is 34. This position pass quality control queck.

BS2

High Homozygotes in GnomAd4 at 24 AD,AR gene

Transcripts

RefSeq

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	MANE	UniProt
COL6A1	NM_001848.3 linkuse as main transcript	c.1506G>C	p.Pro502=	synonymous_variant	22/35	ENST00000361866.8

Ensembl

Gene	Transcript	HGVSc	HGVSp	Effect	#exon/exons	TSL	MANE	Appris	UniProt
COL6A1	ENST00000361866.8 linkuse as main transcript	c.1506G>C	p.Pro502=	synonymous_variant	22/35	1	NM_001848.3	P1
COL6A1	ENST00000683550.1 linkuse as main transcript	n.281G>C		non_coding_transcript_exon_variant	3/5

Frequencies

GnomAD3 genomes

AF:

0.00911

AC:

1385

AN:

152100

Hom.:

Cov.:

show subpopulations

Gnomad AFR

AF:

0.0316

Gnomad AMI

AF:

0.00

Gnomad AMR

AF:

0.00321

Gnomad ASJ

AF:

0.00

Gnomad EAS

AF:

0.00

Gnomad SAS

AF:

0.00

Gnomad FIN

AF:

0.00

Gnomad MID

AF:

0.00316

Gnomad NFE

AF:

0.000118

Gnomad OTH

AF:

0.00813

GnomAD3 exomes

AF:

0.00235

AC:

504

AN:

214078

Hom.:

AF XY:

0.00185

AC XY:

214

AN XY:

115914

show subpopulations

Gnomad AFR exome

AF:

0.0339

Gnomad AMR exome

AF:

0.00159

Gnomad ASJ exome

AF:

0.00

Gnomad EAS exome

AF:

0.00

Gnomad SAS exome

AF:

0.0000370

Gnomad FIN exome

AF:

0.00

Gnomad NFE exome

AF:

0.000118

Gnomad OTH exome

AF:

0.000921

GnomAD4 exome

AF:

0.00105

AC:

1513

AN:

1441818

Hom.:

Cov.:

AF XY:

0.000928

AC XY:

664

AN XY:

715454

show subpopulations

Gnomad4 AFR exome

AF:

0.0356

Gnomad4 AMR exome

AF:

0.00172

Gnomad4 ASJ exome

AF:

0.00

Gnomad4 EAS exome

AF:

0.00

Gnomad4 SAS exome

AF:

0.0000480

Gnomad4 FIN exome

AF:

0.00

Gnomad4 NFE exome

AF:

0.0000644

Gnomad4 OTH exome

AF:

0.00280

GnomAD4 genome

AF:

0.00921

AC:

1402

AN:

152218

Hom.:

Cov.:

AF XY:

0.00903

AC XY:

672

AN XY:

74420

show subpopulations

Gnomad4 AFR

AF:

0.0319

Gnomad4 AMR

AF:

0.00320

Gnomad4 ASJ

AF:

0.00

Gnomad4 EAS

AF:

0.00

Gnomad4 SAS

AF:

0.00

Gnomad4 FIN

AF:

0.00

Gnomad4 NFE

AF:

0.000118

Gnomad4 OTH

AF:

0.00805

Alfa

AF:

0.000471

Hom.:

Bravo

AF:

0.0105

Asia WGS

AF:

0.00606

AC:

AN:

3478

ClinVar

Significance: Benign/Likely benign

Submissions summary: Benign:5

Revision: criteria provided, multiple submitters, no conflicts

LINK: link

Submissions by phenotype

not specified

Benign:2

Benign, criteria provided, single submitter	clinical testing	GeneDx	Aug 08, 2016	This variant is considered likely benign or benign based on one or more of the following criteria: it is a conservative change, it occurs at a poorly conserved position in the protein, it is predicted to be benign by multiple in silico algorithms, and/or has population frequency not consistent with disease. -
Likely benign, criteria provided, single submitter	clinical testing	PreventionGenetics, part of Exact Sciences	-	- -

Bethlem myopathy 1A

Benign:1

Benign, criteria provided, single submitter

clinical testing

Labcorp Genetics (formerly Invitae), Labcorp

Jan 27, 2024

- -

Collagen 6-related myopathy

Benign:1

Benign, criteria provided, single submitter

clinical testing

Illumina Laboratory Services, Illumina

Jan 13, 2018

This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score and internal cut-off values, a variant classified as benign is not then subjected to further curation. The score for this variant resulted in a classification of benign for this disease. -

not provided

Benign:1

Likely benign, criteria provided, single submitter

not provided

Breakthrough Genomics, Breakthrough Genomics

- -

Computational scores

Source: dbNSFP v4.3

Name

Calibrated prediction

Score

Prediction

BayesDel_noAF

Benign

-0.83

CADD

Benign

0.011

DANN

Benign

0.32

Splicing

Name

Calibrated prediction

Score

Prediction

SpliceAI score (max)

0.0

Details are displayed if max score is > 0.2

Find out detailed SpliceAI scores and Pangolin per-transcript scores at spliceailookup.broadinstitute.org

Publications

LitVar

Below is the list of publications found by LitVar. It may be empty.

Variant summary

Frequency

Consequence

Scores

Clinical Significance

Conservation

ACMG classification

Transcripts

RefSeq

Ensembl

Frequencies

ClinVar

Submissions by phenotype

Computational scores

Splicing

Publications

LitVar

Other links and lift over